Rename bzfs command /debug to /serverdebug
Rename bzfs command /debug to /serverdebug

There is already a local /debug defined for the client so the only way
to access this command is from bzadmin unless we make the name unique.

kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1